linux-kernel - Re: [GIT PULL] x86 fixes for 2.6.30-rc8

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Message-ID: <20090530112234.GB1395@ucw.cz>
Date:	Sat, 30 May 2009 13:22:34 +0200
From:	Pavel Machek <pavel@....cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Thomas Gleixner <tglx@...utronix.de> Suresh Siddha" 
	<suresh.siddha@...el.com>, Tejun Heo <tj@...nel.org>,
	Venkatesh Pallapadi <venkatesh.pallapadi@...el.com>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [GIT PULL] x86 fixes for 2.6.30-rc8

Hi!

> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1535,6 +1535,10 @@ and is between 256 and 4096 characters. It is defined in the file
>  			register save and restore. The kernel will only save
>  			legacy floating-point registers on task switch.
>  
> +	noxsave		[BUGS=X86] Disables x86 extended register state save
> +			and restore using xsave. The kernel will fallback to
> +			enabling legacy floating-point and sse state.
> +

Does that mean apps using sse8 will see their registers corrupted if
this option is used? Or are new registers sets always added in a way
that kernel has to enable them first?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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